Combining Texts

You have chosen 'On the Very Idea of a Third Dogma' by Willard Quine, 'Physics' by Aristotle and 'Understanding' by Stephen R. Grimm

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All the ideas for Modality, or select a subheading:
      A. Necessity
      B. Possibility
      C. Sources of Modality
      D. Knowledge of Modality
      E. Possible worlds